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                <h1 class="title-article" id="articleContentId">Mac 升级Python 2.7 到 Python 3.7</h1>
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                <div class="up-time"><span>最后发布:2020-07-25 14:51:48</span><span>首次发布:2019-02-20 23:34:21</span></div>
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                    <p>MAC上默认内置安装了Python 2.7&#xff0c;但是Python 2.7到2020年就会停止维护了&#xff0c;并且有时候会出现依赖库的不兼容问题&#xff0c;那么怎么安装Python 3.X&#xff0c;并且将Python 3.X的版本设置为默认版本呢&#xff1f;</p> 
<p> </p> 
<h3>安装Python 3.7</h3> 
<p>有两种安装方式。</p> 
<p> </p> 
<p>第一种是直接下载python3安装包安装&#xff1a;</p> 
<p>1、下载地址如下&#xff1a;<a href="https://www.python.org/downloads/">https://www.python.org/downloads/</a></p> 
<p>2、点击下载好的pkg文件进行安装</p> 
<p>3、安装完成之后&#xff0c;python 3.70的默认安装路径如下&#xff1a;/Library/Frameworks/Python.framework/Versions/3.7</p> 
<p> </p> 
<p>第二种是使用brew安装&#xff1a;</p> 
<p>1、安装brew</p> 
<p>确保mac上已经安装xcode后&#xff0c;终端使用安装Homebrew</p> 
<pre><code>ruby -e &#34;$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)&#34;</code></pre> 
<p>安装好后&#xff0c;输入&#xff1a;</p> 
<pre><code>brew doctor</code></pre> 
<p>如果出現Your system is ready to brew&#xff0c;代表已经安装成功了。接着就可以安装python。</p> 
<p>2、安装python</p> 
<pre><code>brew search python</code></pre> 
<p>查看python版本</p> 
<p>接着使用</p> 
<pre><code>brew install python3</code></pre> 
<p>安装python3 即可。</p> 
<p> </p> 
<h3>修改profile文件</h3> 
<p>在terminal里运行open  ~/.bash_profile&#xff0c;打开~/.bash_profile&#xff0c;直接修改文件即可</p> 
<p>1、修改方式</p> 
<p><strong>添加&#xff1a;</strong></p> 
<p><span style="color:#3399ea;">PYTHON_PATH&#61;&#34;/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7&#34;</span></p> 
<p><span style="color:#3399ea;">export PYTHON_PATH</span></p> 
<p>2、重启一下Terminal&#xff0c;使修改后的文件生效。</p> 
<p> </p> 
<p>PS&#xff1a;在安装Brew过程中&#xff0c;一直失败。Warning: /usr/local/bin is not in your PATH.<br /> 一直未能安装成功&#xff0c;后在<br /> http://stackoverflow.com/questions/14288682/error-installing-homebrew-brew-command-not-found找到问题所在<br /> 启动终端&#xff0c;输入命令&#xff1a;export PATH&#61;/usr/local/bin:$PATH<br /> 即可解决此问题</p>
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				<div class="desc ellipsis-online ellipsis-online-1">原文链接：https://blog.csdn.net/xummgg/article/details/69053334

1. 前言

<em>Mac</em>系统自带<em>python</em>2.7，本文目的是将自带的<em>python</em><em>升级</em>到3.6版本。
网上有本多的做法是让<em>python</em>2.7和<em>python</em>3.X两个版本共存，博主并不知道，是两版本共存好，还是直接<em>升级</em>好，所以读者要慎重选择方法。

2. 关闭Rootless机制

由...</div>
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任何关于算法、编程、AI行业知识或博客内容的问题，可以随时扫码关注公众号「图灵的猫」，加入&rdquo;学习小组&ldquo;，沙雕博主在线答疑~此外，公众号内还有更多AI、算法、编程和大数据知识分享，以及免费的SSR节点和学习资料。其他平台（知乎/B站）也是同名「图灵的猫」，不要迷路哦~















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和C语言一样，<em>Python</em>也具有全局变量，其定义全局变量的用法有两种：

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该方法是直接在当前模块中进行全局变量定义声明，使用global的声明方式，再进行引用！


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强烈建议不要直接sudo ln -s (会直接覆盖系统原来的link导致想调用自带<em>python</em>的软件出现问题)，修改path variable虽然比较安全，但对于你的需要是没有太大必要的。
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                <a class="title text-truncate" target="_blank" href="https://holidaylovesam.blog.csdn.net/article/details/87736552#comments_14401387" data-report-click='{"mod":"popu_542","spm":"1001.2101.3001.4231","dest":"https://holidaylovesam.blog.csdn.net/article/details/87736552#comments_14401387","ab":"new"}' data-report-view='{"mod":"popu_542","spm":"1001.2101.3001.4231","dest":"https://holidaylovesam.blog.csdn.net/article/details/87736552#comments_14401387","ab":"new"}'>Mac 升级Python 2.7 到 Python 3.7</a>
                <p class="comment ellipsis">
                    <a href="https://blog.csdn.net/yang20678" class="user-name" target="_blank">yang20678: </a>
                    <span class="code-comments">terminal 输入 ： touch ~/.bash_profile; open ~/.bash_profile
然后再继续下一步</span>
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                <a class="title text-truncate" target="_blank" href="https://holidaylovesam.blog.csdn.net/article/details/79736342#comments_14341620" data-report-click='{"mod":"popu_542","spm":"1001.2101.3001.4231","dest":"https://holidaylovesam.blog.csdn.net/article/details/79736342#comments_14341620","ab":"new"}' data-report-view='{"mod":"popu_542","spm":"1001.2101.3001.4231","dest":"https://holidaylovesam.blog.csdn.net/article/details/79736342#comments_14341620","ab":"new"}'>AI人脸识别的测试重点</a>
                <p class="comment ellipsis">
                    <a href="https://blog.csdn.net/u012804784" class="user-name" target="_blank">「 虚幻私塾」: </a>
                    <span class="code-comments">写的就是好</span>
                </p>
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                <a class="title text-truncate" target="_blank" href="https://holidaylovesam.blog.csdn.net/article/details/79460056#comments_14316589" data-report-click='{"mod":"popu_542","spm":"1001.2101.3001.4231","dest":"https://holidaylovesam.blog.csdn.net/article/details/79460056#comments_14316589","ab":"new"}' data-report-view='{"mod":"popu_542","spm":"1001.2101.3001.4231","dest":"https://holidaylovesam.blog.csdn.net/article/details/79460056#comments_14316589","ab":"new"}'>代码管理的规范</a>
                <p class="comment ellipsis">
                    <a href="https://blog.csdn.net/qq_39756476" class="user-name" target="_blank">魔剑士淡定: </a>
                    <span class="code-comments">有毒</span>
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                <a class="title text-truncate" target="_blank" href="https://holidaylovesam.blog.csdn.net/article/details/87736552#comments_14308410" data-report-click='{"mod":"popu_542","spm":"1001.2101.3001.4231","dest":"https://holidaylovesam.blog.csdn.net/article/details/87736552#comments_14308410","ab":"new"}' data-report-view='{"mod":"popu_542","spm":"1001.2101.3001.4231","dest":"https://holidaylovesam.blog.csdn.net/article/details/87736552#comments_14308410","ab":"new"}'>Mac 升级Python 2.7 到 Python 3.7</a>
                <p class="comment ellipsis">
                    <a href="https://blog.csdn.net/m0_51732766" class="user-name" target="_blank">m0_51732766: </a>
                    <span class="code-comments">我的~/.bash_profile 不存在怎么办</span>
                </p>
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                <a class="title text-truncate" target="_blank" href="https://holidaylovesam.blog.csdn.net/article/details/80867196#comments_14296898" data-report-click='{"mod":"popu_542","spm":"1001.2101.3001.4231","dest":"https://holidaylovesam.blog.csdn.net/article/details/80867196#comments_14296898","ab":"new"}' data-report-view='{"mod":"popu_542","spm":"1001.2101.3001.4231","dest":"https://holidaylovesam.blog.csdn.net/article/details/80867196#comments_14296898","ab":"new"}'>Python内置函数作用及解析</a>
                <p class="comment ellipsis">
                    <a href="https://blog.csdn.net/qq_52744406" class="user-name" target="_blank">Python过过过qwq: </a>
                    <span class="code-comments">谢谢！</span>
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